136568321 has 2 divisors, whose sum is σ = 136568322. Its totient is φ = 136568320.

The previous prime is 136568317. The next prime is 136568329. The reversal of 136568321 is 123865631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110670400 + 25897921 = 10520^2 + 5089^2 .

It is a cyclic number.

It is not a de Polignac number, because 136568321 - 2² = 136568317 is a prime.

It is not a weakly prime, because it can be changed into another prime (136568329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68284160 + 68284161.

It is an arithmetic number, because the mean of its divisors is an integer number (68284161).

Almost surely, 2^136568321 is an apocalyptic number.

It is an amenable number.

136568321 is a deficient number, since it is larger than the sum of its proper divisors (1).

136568321 is an equidigital number, since it uses as much as digits as its factorization.

136568321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 136568321 is about 11686.2449486565. The cubic root of 136568321 is about 514.9716526955.

The spelling of 136568321 in words is "one hundred thirty-six million, five hundred sixty-eight thousand, three hundred twenty-one".